Wondering what type of formula Trugreen uses to eliminate weeds. I've been using natural fertilizer for about the last year or so and I'm really satisfied with the results, however it's a little too good as the weeds try to take over. Looking for something similar to what Trugreen uses. I really just want something that will kill all the weeds (dandelions, creeping charlie, etc..) I don't really need the fertilizer part as I have that covered.